// Copyright [2020] <Weaverzhu>
#include <bits/stdc++.h>
using namespace std;
// #define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
#define dbg(x...) { cerr << "\033[32;1m" << #x << " -> "; err(x); }
void err() { cerr << "\033[39;0m" << endl; }
template<typename T, typename... A>
void err(T a, A... x) { cerr << a << ' '; err(x...); }
#else
#define dbg(...)
#endif

typedef long long LL;
const int N = 1e3+50;
int n, m;
int a[N];

int main(int argc, char const *argv[]) {
    // code
    scanf("%d%d", &n, &m);
    if (n > m) {
        puts("0");
        return 0;
    }
    LL res = 1;
    for (int i=0; i<n; ++i)
        scanf("%d", &a[i]);
    for (int i=0; i<n; ++i)
        for (int j=i+1; j<n; ++j) {
            res = res * abs(a[j] - a[i]) % m;
        }
    printf("%lld\n", res);
    return 0;
}
